[PATCH v3 0/2] arch/riscv: Add bitrev.h file to support rev8 and brev8

Jinjie Ruan ruanjinjie at huawei.com
Fri Apr 17 02:31:00 PDT 2026


Add bitrev.h file to support rev8 and brev8 for riscv.

Tested functionally on riscv64 QEMU with:
	"-M virt,acpi=on,zbkb=true,zbb=true"

Changes in v3:
- Fix the build issue by remving the CONFIG_HAVE_ARCH_BITREVERSE macro
  for byte_rev_table.
- Update the riscv implementation as David suggested.
- Add Reviwed-by.

Changes in v2:
- Define generic __bitrev8/16/32 for reuse in riscv.

Jinjie Ruan (2):
  bitops: Define generic __bitrev8/16/32 for reuse
  arch/riscv: Add bitrev.h file to support rev8 and brev8

 arch/riscv/Kconfig                    |  1 +
 arch/riscv/include/asm/bitrev.h       | 55 +++++++++++++++++++++++++++
 include/asm-generic/bitops/__bitrev.h | 22 +++++++++++
 include/linux/bitrev.h                | 20 ++--------
 lib/bitrev.c                          |  3 --
 5 files changed, 82 insertions(+), 19 deletions(-)
 create mode 100644 arch/riscv/include/asm/bitrev.h
 create mode 100644 include/asm-generic/bitops/__bitrev.h

-- 
2.34.1




More information about the linux-riscv mailing list